178 vMoxiD-i:. 



A^ar. candaharica {Hanleij 4' Theobald) ; Simpson, Washington, 

 D.C., Smiths. Inst., Xat. Mas. Proc. xxii, 1900, p. 855. 



Unto marqinalis var. candaharica, II. & T., C. I. 1876, p. 20, pi. 43, 

 fig. 4 ; Ilutton, J. A. S. B. xviii, pt. 1, 1849 (1850), p. 660. 



Ori(jinal description: — Shell oval oblong, ventricose, tumid 

 not produced nor attenuated behind ; beaks flattened and denuded ; 

 upper edge rounded or falling ; lower edge curved ; strongly- 

 wrinkled transversely ; epidermis olive-brown, in young specimens 

 with broad yellowish margin. 



The dimensions of three specimens mentioned by Ilutton 

 are : — 



1. 1>. 3. 



Long 41-25 41-25 44-25 mm. 



Lat 75 73 78 mm. 



and of two specimens, both from Candahar, in the Indian 

 Museum : — 



1. 2. 



Lonty 37*5 38-25 mm. 



Lat 655 68-5 mm. 



Diam 22-5 24-5 mm. 



Hah. Candaluir, in canals. 



Hutton further states that it differs from typical U. marginalis, 

 Lk. "■ in the less produced and lengthened form pos- 

 teriorly, in the upper part of the anterior edge being straighter 

 and more elevated than in U. marginalis, and in the beaks being 

 less denuded and more wrinkled. In Unio marr/inaUs of the 

 Gan"-etic Provinces the breadth appears to exceed the length 

 much more considerably than in the Candahar shells, measuring 

 in four specimens of each as follows : — 



" Indian [Gangetic Provinces] specimen, 



1. 2. 3. 4. 



Long 35 41-25 35 38 mm. 



Lat.° 40 bit bO 76-5 mm. 



"Afchan specimens, 



^ 1. 2. 3. 4. 



Lono- 10 41-25 41-25 46 mm. 



Lat 75 7') 75 78 mm. 



" The proportions thus appear to be reversed ; the Indian 

 species showing a greater transverse breadth in proportion to its 

 leno-th, the Afghan one showing a greater length in proportion to 

 its breadth. All my specimens of the Indian variety^ are produced 

 or elongated posteriorly, giving the shell a narrow wedge-shaped 

 appearance, whereas the Afghan one, being transversely shorter, 

 appears ovatc-oblong."' 



